You are looking at a new , boxed Millett Colt Combat White Outline Low Profile Adjustable Rear Sight .
This
sight is meant to be a fit on Colt 1911 ,and all Colt variants except
Gold Cups . It can also be fitted to most of the many Colt clones .
To
fit properly you will need a competent gunsmith , or have acess to a
machine shop as the slide requires milling and a new dovetail .
It will fit many other handguns if you have the machinery required to modify the slide and cut new dovetails .
To qualify for lower postal rates the box may be folded flat when it is shipped out